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1261 e7
f6
f7
g5
g6
h5
h6
Applicable part
Functional classification
Part which accommodates a particularly wide gap, or a moving part which requires a gap Part which for functional reasons requires a large gap Piston ring and piston ring groove Part which accommodates a wide gap to facilitate assembly Expands. Large positional error. Fitting by means of a loose set pin Part which requires an appropriate gap even at high temperatures Long fitting length
d9
d9
Part which accommodates a wide gap, or which requires a wide gap
Cost needs to be reduced. Manufacturing cost Maintenance cost
Crank web and pin bearing(side) Exhaust valve box and spring bearing sliding part Piston ring and piston ring groove
e8
e9
Part which accommodates a fairly wide gap, or a moving part which requires a gap Fairly wide gap and well lubricated bearing Bearing subjected to high temperature, high speed, and high load(high-degree forced lubrication)
Regular rotating or sliding part (Must be well lubricated.)
Fitting of exhaust valve seat Main bearing for crankshaft Regular sliding part stripper bolt MSB(e9)
f7
Fitting which provides an appropriate clearance and permits movement(high-quality fitting).
f8
Regular normal-temperature bearing lubricated with grease or oil
Regular fitting part (is often disassembled)
Continuously rotating part of a precision machine under light load Fitting with a narrow gap and which permits movement(spigot, positioning) High-precision sliding part h7
h9
h8
Installation part which is compatible with a very small tightening interference High-precision positioning which locks both parts in place while unit is in use Fitting which can be assembled/disassembled using a wooden or lead hammer
js5
k6
Fitting which requires an iron hammer or hand press for assembly/disassembly(A key or other device is required in order to prevent inter-part shaft rotation.) Precision positioning
k5
m6
m5
n6
h6
n5
p5
r6
r5
s6
Link device pin and lever Key and key groove Precision control valve rod Guide lifter pin(g6)
Part requiring precision motion with almost no gap
Fitting of rim and boss Fitting of gears in a precision gear device Dowel pin MSTH(h7) Fitting two coupling flanges Governor path and pin Fitting force alone is Fitting of gear rim and boss insufficient for Difficult to disassemble transmitting force Fitting of gear pump shaft and casing without damaging the Reamer bolt part. Reamer bolt Dowel pin MSTM(m6) Fastening of hydraulic device pistons and shafts Fitting of coupling flange and shaft
Assembly/disassembly are the same as the above. Precision positioning which permits no gap at all
Fitting of flexible shaft coupling and gear(passive side) Precision fitting Punch SPAS, etc.(m5) Fitting force along is Insertion of suction valve and valve guide Die MHD, etc.(m5) sufficient for Insertion of suction valve and valve guide Straight die MSD, etc.(n5) transmitting small Fixing a gear and shaft together(small torque)Dowel pin MST(p6) force Flexible coupling shaft and gear(drive side)
Fitting which requires considerable force for assembly/disassembly Precision stationary fitting(A key or other device is required for high-torque transmission purposes.) Fitting which requires large force for assembly/disassembly(A key or other device is required for high-torque transmission purposes.) However, only light press-fitting force is required for press-fitting when both parts are non-ferrous parts. Fastened using the standard press-fitting for fastening a ferrous part to a ferrous, bronze, or copper part
p6
n6
Part where a cooled exhaust valve box is inserted Regular shaft and bushing Link device lever and bushing
Fitting which allows movement by hand when a lubricant is used(high-quality positioning) Special high-precision sliding part Unimportant stationary part
js6
h5
Application example
c9
Loose fit Loose roll fit
Clearance fit
Roll fit Push fit Sliding fit Tight roll fit
Transition fit
Striking Light press fit Press fit
Interference fit
Parts can move relative to each other
H9
Assembly/disassembly are the same as the above. Shrinkage press fitting, cold press fitting or forced press fitting is required for large parts Difficult to disassemble without damaging the part. Permanent assembly in which parts are both tightly fastened together and
t6
will not be disassembled, and which requires shrinkage press fitting, cold press fitting, or forced press fitting. For light alloys, only ordinary press fitting is required.
u6
Coupling and shaft Fitting force is capable of transmitting considerable force
x6
Fitting and fixing a bearing bushing Insertion of suction valve and valve seat Fixing a coupling flange and shaft together(large torque) Fixing a drive gear rim and boss together Fitting and fixing a bearing bushing
Excerpts from “Product Manual(Accuracy BASIS OF SELECTION FOR FITS Version) ” in JIS “How to Use” series
Parts cannot move relative to each other.
H8
[TECHNICAL DATA]
1261-1262
Strong press fit, shrinkage press fit, cold press fit
PD-06.indd
H7
H6
The items printed in red in the Application example are press die parts presented in this catalogue.
Note: *Exceptions for these fittings may arise depending on the dimensional sectioning scheme.
Shaft tolerance range class f6 g5 g6 h5 h6 js5 js6 k5 k6 m5 m6 n6 p6 e7 f6 f7 g6 h6 h7 js6 js7 k6 m6 n6 p6 r6 s6 t6 u6 x6 d9 e8 e9 f7 f8 h7 h8 c9 d8 d9 g8 e9 h8 h9 b9 c9 d9
0
H7
H8
Clearance fit
Clearance fit
Clearance fit
Close fit
Transition fit
Clearance fit
Hole tolerance range class M6 JS6 K5 M6 N6 P6 F6 F7 G6 G7 H6 H7 JS6 JS7 K6 K7 M6 M7 N6 N7 P6 P7 R7 S7 T7 U7 X7 E7 F7 F8 H7 H8 D8 D9 E8 E9 F8 H8 H9 B10 C9 C10 D8 D9 D10 E8 E9 H8 H9
200
H10 H6
Close fit
Fitting
H9
-50
Dimension tolerance
Dimension tolerance
50
2.2 Correlation of tolerance ranges in fitting with the regularly used shaft adopted as reference h5 h6 h7 h8 h9 Reference shaft Clearance fit
H10 Clearance fit
Clearance fit
Roll fit
Loose roll fit Light roll fit
Forced press fit
Shrinkage press fit
Striking
Press fit
Sliding fit
Fitting
Close fit
Clearance fit
Transition fit
1.2 Correlation of tolerance ranges in fitting with the regularly used hole adopted as reference Reference hole H6 H7 H8 H9 Clearance fit Transition fit Close fit Clearance fit
Transition fit
Note: *Exceptions for these fittings may arise depending on the dimensional sectioning scheme.
150
100
(µm) -100
(µm) 50
-150
0
-200
17:11:35
1262
2012/10/25
* Cases in which the measurement exceeds the reference dimension in the above table(18mm)but does not exceed 30mm.
h5
h6
h6
h7
h8
h9
-50 * Cases in which the measurement exceeds the reference dimension in the above table(18mm)but does not exceed 30mm.
Excerpts from JIS B DIMENSIONAL TOLERANCES AND FITS 0401 (1999)
2.1 Fitting with regularly used shaft adopted as reference Hole tolerance range class Reference shaft Clearance fit Transition fit Close fit N6 * H6 JS6 K6 M6 h5 P6 N6 P6 * F6 G6 H6 JS6 K6 M6 h6 s6 t6 u6 x6 P7 * R7 S7 T7 U7 X7 N7 F7 G7 H7 JS7 K7 M7 E7 F7 H7 h7 F8 H8 D8 E8 F8 H8 h8 D9 E9 H9 D8 E8 H8 C9 D9 E9 H9 h9 B10 C10 D10
[TECHNICAL DATA]
1.1 Fitting with regularly used hole adopted as reference Shaft tolerance range class Reference hole Clearance fit Transition fit Close fit g5 h5 js5 k5 m5 H6 f6 g6 h6 js6 k6 m6 p6 * n6 * n6 f6 g6 h6 js6 k6 m6 p6 * r6 * H7 e7 f7 h7 js7 f7 h7 H8 e8 f8 h8 d9 e9 d8 e8 h8 H9 c9 d9 e9 h9 H10 b9 c9 d9